Elmira-1, also known as Don Sinn Detention, is a private earth dam located in Whalen, Olmsted County, Minnesota. Built in 1981 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction along Trout Run Creek-TR. Standing at a height of 39 feet with a storage capacity of 57 acre-feet, Elmira-1 covers a surface area of 2.2 acres and has a drainage area of 0.69 square miles.

Managed by the MNDNR EWR, Elmira-1 is state-regulated and undergoes regular inspections to ensure its fair condition. Despite being classified as low hazard potential, the dam is considered to have a very high risk level, reflecting its critical importance in mitigating flooding risks in the area. With a controlled spillway and uncontrolled outlet gates, Elmira-1 plays a crucial role in safeguarding the surrounding community from potential water-related disasters.

For water resource and climate enthusiasts, Elmira-1 presents a fascinating case study in flood risk management and dam infrastructure in Minnesota. As a key component of the state's flood protection measures, this earth dam serves as a vital line of defense against the destructive forces of nature, highlighting the importance of sustainable water resource management and climate resilience in the face of increasing environmental challenges.